/*******************************************************************************
 *  Copyright 2001, 2007 JamesLuo(JamesLuo.au@gmail.com)
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may not
 *  use this file except in compliance with the License. You may obtain a copy of
 *  the License at
 *  
 *  http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 *  License for the specific language governing permissions and limitations under
 *  the License.
 * 
 *  Contributors:
 *******************************************************************************/



package com.gwtent.aop.matcher;

/**
 * Implements {@code and()} and {@code or()}.
 *
 * @author crazybob@google.com (Bob Lee)
 */
public abstract class AbstractMatcher<T> implements Matcher<T> {

  public Matcher<T> and(final Matcher<? super T> other) {
    return new AndMatcher<T>(this, other);
  }

  public Matcher<T> or(Matcher<? super T> other) {
    return new OrMatcher<T>(this, other);
  }

  static class AndMatcher<T> extends AbstractMatcher<T> {

    final Matcher<? super T> a, b;

    public AndMatcher(Matcher<? super T> a, Matcher<? super T> b) {
      this.a = a;
      this.b = b;
    }

    public boolean matches(T t) {
      return a.matches(t) && b.matches(t);
    }
  }

  static class OrMatcher<T> extends AbstractMatcher<T> {

    final Matcher<? super T> a, b;

    public OrMatcher(Matcher<? super T> a, Matcher<? super T> b) {
      this.a = a;
      this.b = b;
    }

    public boolean matches(T t) {
      return a.matches(t) || b.matches(t);
    }
  }
}
